\begin{lstlisting}[frame=shadowbox, language=C, numbers=left, breaklines=true, basicstyle=\footnotesize]
#ifndef IMPRIMIR_STDIN_H_
#define IMPRIMIR_STDIN_H_

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#define FIELD_SEPARATOR '\n'

int buscar_ultimo_fin_linea (const char *buffer, int tam_buffer);

int imprimir_lineas_buffer(char* buffer,int);

#endif /* IMPRIMIR_STDIN_H_ */
\end{lstlisting}
